Emerald can be sometimes referred as "useless" becuase it is only used as a trading device for villagers. But what if we couldve use it in another way, emerald armour and tools. It would be slightly more powerful than diamond armor, and would cause much more damage than diamond swords. Also emerald pickaxes would mine stone much faster than any other pickaxe? What do you think, comment below!
Even if emerald tools and armor were added, they aren't going to balance them around the rarity of the ore that was removed for a snapshot or two because people complained it was too rare, they're going to balance them around the fact that you can get tons of them from trading, which is literally why they were added in the first place.